238136621 has 2 divisors, whose sum is σ = 238136622. Its totient is φ = 238136620.

The previous prime is 238136609. The next prime is 238136653. The reversal of 238136621 is 126631832.

It is an a-pointer prime, because the next prime (238136653) can be obtained adding 238136621 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162690025 + 75446596 = 12755^2 + 8686^2 .

It is a cyclic number.

It is not a de Polignac number, because 238136621 - 2¹⁴ = 238120237 is a prime.

It is a super-2 number, since 2×238136621² = 113418100522595282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238106621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119068310 + 119068311.

It is an arithmetic number, because the mean of its divisors is an integer number (119068311).

Almost surely, 2^238136621 is an apocalyptic number.

It is an amenable number.

238136621 is a deficient number, since it is larger than the sum of its proper divisors (1).

238136621 is an equidigital number, since it uses as much as digits as its factorization.

238136621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 32.

The square root of 238136621 is about 15431.6758973224. The cubic root of 238136621 is about 619.8340008246.

The spelling of 238136621 in words is "two hundred thirty-eight million, one hundred thirty-six thousand, six hundred twenty-one".